Apr 22 11:34:31 host21 kernel: drbd0: PingAck did not arrive in time.
Apr 22 11:34:31 host21 kernel: drbd0: peer( Primary -> Unknown ) conn( Connected -> NetworkFailure ) pdsk(
 UpToDate -> DUnknown ) 
Apr 22 11:34:31 host21 kernel: drbd0: asender terminated
Apr 22 11:34:31 host21 kernel: drbd0: Terminating asender thread
Apr 22 11:34:31 host21 kernel: drbd0: short read expecting header on sock: r=-512
Apr 22 11:34:31 host21 kernel: drbd0: Writing meta data super block now.
Apr 22 11:34:31 host21 kernel: drbd0: tl_clear()
Apr 22 11:34:31 host21 kernel: drbd0: Connection closed
Apr 22 11:34:31 host21 kernel: drbd0: conn( NetworkFailure -> Unconnected ) 
Apr 22 11:34:31 host21 kernel: drbd0: receiver terminated
Apr 22 11:34:31 host21 kernel: drbd0: receiver (re)started
Apr 22 11:34:31 host21 kernel: drbd0: conn( Unconnected -> WFConnection ) 
Apr 22 11:37:31 host21 kernel: drbd0: Handshake successful: Agreed network protocol version 88
Apr 22 11:37:31 host21 kernel: drbd0: conn( WFConnection -> WFReportParams ) 
Apr 22 11:37:31 host21 kernel: drbd0: Starting asender thread (from drbd0_receiver [4797])
Apr 22 11:37:31 host21 kernel: drbd0: data-integrity-alg: <not-used>
Apr 22 11:37:31 host21 kernel: drbd0: peer( Unknown -> Secondary ) conn( WFReportParams -> WFBitMapT ) pds
k( DUnknown -> UpToDate ) 
Apr 22 11:37:31 host21 kernel: drbd0: Writing meta data super block now.
Apr 22 11:37:33 host21 kernel: drbd0: conn( WFBitMapT -> WFSyncUUID ) 
Apr 22 11:37:33 host21 kernel: drbd0: helper command: /sbin/drbdadm before-resync-target
Apr 22 11:37:33 host21 kernel: drbd0: conn( WFSyncUUID -> SyncTarget ) disk( UpToDate -> Inconsistent ) 
Apr 22 11:37:33 host21 kernel: drbd0: Began resync as SyncTarget (will sync 520192 KB [130048 bits set]).
Apr 22 11:37:33 host21 kernel: drbd0: Writing meta data super block now.
Apr 22 11:37:44 host21 kernel: drbd0: Resync done (total 11 sec; paused 0 sec; 47288 K/sec)
Apr 22 11:37:44 host21 kernel: drbd0: conn( SyncTarget -> Connected ) disk( Inconsistent -> UpToDate ) 
Apr 22 11:37:44 host21 kernel: drbd0: helper command: /sbin/drbdadm after-resync-target
Apr 22 11:37:44 host21 kernel: drbd0: Writing meta data super block now.
Apr 22 11:38:35 host21 kernel: drbd0: PingAck did not arrive in time.
Apr 22 11:38:35 host21 kernel: drbd0: peer( Secondary -> Unknown ) conn( Connected -> NetworkFailure ) pds
k( UpToDate -> DUnknown ) 
Apr 22 11:38:35 host21 kernel: drbd0: asender terminated
Apr 22 11:38:35 host21 kernel: drbd0: Terminating asender thread
Apr 22 11:38:35 host21 kernel: drbd0: short read expecting header on sock: r=-512
Apr 22 11:38:35 host21 kernel: drbd0: Writing meta data super block now.
Apr 22 11:38:35 host21 kernel: drbd0: tl_clear()
Apr 22 11:38:35 host21 kernel: drbd0: Connection closed
Apr 22 11:38:35 host21 kernel: drbd0: conn( NetworkFailure -> Unconnected ) 
Apr 22 11:38:35 host21 kernel: drbd0: receiver terminated
Apr 22 11:38:35 host21 kernel: drbd0: receiver (re)started
Apr 22 11:38:35 host21 kernel: drbd0: conn( Unconnected -> WFConnection ) 
Apr 22 11:39:04 host21 kernel: drbd0: Handshake successful: Agreed network protocol version 88
Apr 22 11:39:04 host21 kernel: drbd0: conn( WFConnection -> WFReportParams ) 
Apr 22 11:39:04 host21 kernel: drbd0: Starting asender thread (from drbd0_receiver [4797])
Apr 22 11:39:04 host21 kernel: drbd0: data-integrity-alg: <not-used>
Apr 22 11:39:04 host21 kernel: drbd0: peer( Unknown -> Secondary ) conn( WFReportParams -> Connected ) pds
k( DUnknown -> UpToDate ) 
Apr 22 11:39:04 host21 kernel: drbd0: Writing meta data super block now.